Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

First 3-D Magnetic Reconnection Measurements

08.11.2002


In work that promises new insights into the cosmos and fusion-energy production alike, physicists have reported they have made the first three-dimensional laboratory measurements of magnetic reconnection, the main process by which magnetic fields release energy in the universe.


Data show reconnection of two partially merging rings of plasma. The green and gray field lines represent private and reconnected field lines, respectively. The red reconnected field line crosses normal to the reconnection plane, indicating a 3-D character.



Magnetic reconnection is the phenomenon in which magnetic energy in a plasma is rapidly converted to heat and jets of energetic particles. This process is thought to heat the solar corona, the outer atmosphere of the sun, to temperatures 1000 times greater than the sun’s surface itself, as well as to accelerate particles to high energies, possibly even to the very high energies of cosmic rays. Magnetic reconnection is also an important process in some experimental fusion energy reactors that use magnetic fields to confine the plasma.

The physical picture of magnetic reconnection is of two strands of magnetized plasma with oppositely directed magnetic field merging together. Until recently, this process has been studied only in two dimensions--theoretically, computationally, and experimentally.


Now, 3D experimental measurements of magnetic reconnection have been made at the Swarthmore Spheromak Experiment (SSX) at Swarthmore College. At SSX, physicists merge rings of magnetized plasma called spheromaks. Compact probes measure up to 600 magnetic field components more than a million times a second. This permits detailed studies of the ever-changing 3D magnetic structures resulting from these experiments. Measurements of the spheromaks reveal a swept and sheared magnetic structure in the reconnection region (see figure).

With SSX, researchers hope to elucidate fundamental plasma physics processes on the sun and understand new plasma structures in magnetic confinement fusion machines.

Contacts
Michael Brown (610) 328-8648, doc@swarthmore.edu, Swarthmore College
Chris Cothran (610- 690-5778, ccothra1@swarthmore.edu, Swarthmore College

David Harris | EurekAlert!
Further information:
http://www.aps.org/meet/DPP02/baps/press/press4.html
http://www.aps.org/meet/DPP02/baps/abs/S2210001.html

More articles from Physics and Astronomy:

nachricht First direct observation and measurement of ultra-fast moving vortices in superconductors
20.07.2017 | The Hebrew University of Jerusalem

nachricht Manipulating Electron Spins Without Loss of Information
19.07.2017 | Universität Basel

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Manipulating Electron Spins Without Loss of Information

Physicists have developed a new technique that uses electrical voltages to control the electron spin on a chip. The newly-developed method provides protection from spin decay, meaning that the contained information can be maintained and transmitted over comparatively large distances, as has been demonstrated by a team from the University of Basel’s Department of Physics and the Swiss Nanoscience Institute. The results have been published in Physical Review X.

For several years, researchers have been trying to use the spin of an electron to store and transmit information. The spin of each electron is always coupled...

Im Focus: The proton precisely weighted

What is the mass of a proton? Scientists from Germany and Japan successfully did an important step towards the most exact knowledge of this fundamental constant. By means of precision measurements on a single proton, they could improve the precision by a factor of three and also correct the existing value.

To determine the mass of a single proton still more accurate – a group of physicists led by Klaus Blaum and Sven Sturm of the Max Planck Institute for Nuclear...

Im Focus: On the way to a biological alternative

A bacterial enzyme enables reactions that open up alternatives to key industrial chemical processes

The research team of Prof. Dr. Oliver Einsle at the University of Freiburg's Institute of Biochemistry has long been exploring the functioning of nitrogenase....

Im Focus: The 1 trillion tonne iceberg

Larsen C Ice Shelf rift finally breaks through

A one trillion tonne iceberg - one of the biggest ever recorded -- has calved away from the Larsen C Ice Shelf in Antarctica, after a rift in the ice,...

Im Focus: Laser-cooled ions contribute to better understanding of friction

Physics supports biology: Researchers from PTB have developed a model system to investigate friction phenomena with atomic precision

Friction: what you want from car brakes, otherwise rather a nuisance. In any case, it is useful to know as precisely as possible how friction phenomena arise –...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

»We are bringing Additive Manufacturing to SMEs«

19.07.2017 | Event News

The technology with a feel for feelings

12.07.2017 | Event News

Leipzig HTP-Forum discusses "hydrothermal processes" as a key technology for a biobased economy

12.07.2017 | Event News

 
Latest News

Researchers create new technique for manipulating polarization of terahertz radiation

20.07.2017 | Information Technology

High-tech sensing illuminates concrete stress testing

20.07.2017 | Materials Sciences

First direct observation and measurement of ultra-fast moving vortices in superconductors

20.07.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>